26 July 2016 AOF LTAO mode: reconstruction strategy and first test results
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Abstract
GALACSI is the Adaptive Optics (AO) system serving the instrument MUSE in the framework of the Adaptive Optics Facility (AOF) project. Its Narrow Field Mode (NFM) is a Laser Tomography AO (LTAO) mode delivering high resolution in the visible across a small Field of View (FoV) of 7.5" diameter around the optical axis. From a reconstruction standpoint, GALACSI NFM intends to optimize the correction on axis by estimating the turbulence in volume via a tomographic process, then projecting the turbulence profile onto one single Deformable Mirror (DM) located in the pupil, close to the ground.

In this paper, the laser tomographic reconstruction process is described. Several methods (virtual DM, virtual layer projection) are studied, under the constraint of a single matrix vector multiplication. The pseudo-synthetic interaction matrix model and the LTAO reconstructor design are analysed. Moreover, the reconstruction parameter space is explored, in particular the regularization terms.

Furthermore, we present here the strategy to define the modal control basis and split the reconstruction between the Low Order (LO) loop and the High Order (HO) loop. Finally, closed loop performance obtained with a 3D turbulence generator will be analysed with respect to the most relevant system parameters to be tuned.
© (2016) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Sylvain Oberti, Sylvain Oberti, Johann Kolb, Johann Kolb, Miska Le Louarn, Miska Le Louarn, Paolo La Penna, Paolo La Penna, Pierre-Yves Madec, Pierre-Yves Madec, Benoit Neichel, Benoit Neichel, Jean-François Sauvage, Jean-François Sauvage, Thierry Fusco, Thierry Fusco, Robert Donaldson, Robert Donaldson, Christian Soenke, Christian Soenke, Marcos Suárez Valles, Marcos Suárez Valles, Robin Arsenault, Robin Arsenault, } "AOF LTAO mode: reconstruction strategy and first test results", Proc. SPIE 9909, Adaptive Optics Systems V, 99091U (26 July 2016); doi: 10.1117/12.2233396; https://doi.org/10.1117/12.2233396
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